Heteropycnosis
Under Heteropyknose (from the Greek hetero = different, otherwise + pycnos = dense, compact) is understood in the cell biology differentiated dyeing behavior of chromosomes . The term is used to differentiate sections of the colored chromosome and comes from the fact that it was assumed that the intensity of the color depends on the degree of packaging of the DNA . The Euchromatin is considered to be “normally colored”. Heterochromatin is either more strongly colored (positive heteropycnotic) or less colored (negative heteropyknotic) than the euchromatin. Often the terms “heterochromatic” and “heteropycnotic” are synonymous , although the former denotes the heteropycnosis exhibiting chromatin and the latter denotes the coloring behavior itself. Heterochromatin can also change its coloring behavior (become isopyknotic), but it would still remain heterochromatin.
literature
SS Rajan: Microbial Genetics Anmol Publications PVT. LTD. 2003. ISBN 8126113367
swell
- ^ E. Weiss, R. Hoffmann and I. Rothemund: Die Karyogramme der Haussammiere In: Zuchthygiene . 2, 1967, pp. 152-155
- ↑ E. Schneider, U. Heukamp and F. Pera: Loss of heteropycnosis of the constitutive heterochromatin in specifically activated cells of the thyroid gland of Microtus agrestis In: Chromosoma . 41 (2), June 1973, pp. 167-173